When you need extra insulation against the elements, good shock absorption and support under heavy loads, this is the sock for you. Heavy cushioning throughout this sock makes it perfect for hardcore hiking, long treks and heavy-laden backpacking. This heavyweight cushioning also provides extra comfort, insulation and protection. Elasticized ankle brace holds heel in place and allows for less bulk and greater forward flex in the boot. Features a High Density Footbed HDF for improved performance, comfort and durability. Crew height. Content 77% SmartWool, 22% nylon, 1% elastic. Machine wash warm. Tumble dry. Do not bleach. Available Colors Gray, Navy, Taupe, Forest.